Display device

Abstract

A display device can include a display panel having a plurality of pixels, and a luminance compensating unit. The luminance compensating unit can adjust a gamma voltage according to a difference between a first high potential voltage and a second high potential voltage. The first high potential voltage can be supplied to a pixel that is the most adjacent to one side of the display panel, among the plurality of pixels. The second high potential voltage can be supplied to a pixel that is the most adjacent to another side of the display panel, among the plurality of pixels.

What is claimed is: 
     
         1 . A display device, comprising:
 a display panel including a plurality of pixels; and   a luminance compensating unit configured to adjust a gamma voltage according to a difference value between a first high potential voltage and a second high potential voltage, the first high potential voltage being supplied to a pixel that is most adjacent to one side of the display panel, among the plurality of pixels, and the second high potential voltage being supplied to a pixel that is most adjacent to another side of the display panel, among the plurality of pixels.   
     
     
         2 . The display device according to  claim 1 , wherein the luminance compensating unit includes:
 a source high potential voltage compensating unit configured to output a source high potential voltage compensated according to the difference value between the first high potential voltage and the second high potential voltage; and   a gamma voltage generating unit configured to output a gamma voltage according to the compensated source high potential voltage.   
     
     
         3 . The display device according to  claim 2 , wherein the source high potential voltage compensating unit includes:
 a voltage drop amount amplifying unit configured to amplify and output the difference value between the first high potential voltage and the second high potential voltage; and   a source high potential voltage amplifying unit configured to output the source high potential voltage compensated by adding the amplified difference value and the source high potential voltage.   
     
     
         4 . The display device according to  claim 3 , wherein the voltage drop amount amplifying unit includes:
 an inverting input terminal;   a non-inverting input terminal;   an output terminal;   a first resistor connected to the inverting input terminal;   a second resistor and a third resistor connected to the non-inverting input terminal; and   a first feedback resistor connected between the output terminal and the inverting input terminal.   
     
     
         5 . The display device according to  claim 3 , wherein the source high potential voltage amplifying unit includes:
 an inverting input terminal;   a non-inverting input terminal;   an output terminal;   a fourth resistor connected to the inverting input terminal;   a fifth resistor connected between an output terminal of the voltage drop amount amplifying unit and the non-inverting input terminal;   a sixth resistor connected between the non-inverting input terminal and a line to which the source high potential voltage is supplied; and   a second feedback resistor connected between the output terminal of the source high potential voltage amplifying unit and the inverting input terminal.   
     
     
         6 . The display device according to  claim 3 , wherein the difference value output from the voltage drop amount amplifying unit is input to a non-inverting input terminal of the source high potential voltage amplifying unit, and the source high potential voltage is input to the non-inverting input terminal of the source high potential voltage amplifying unit. 
     
     
         7 . The display device according to  claim 3 , wherein the gamma voltage generating unit includes:
 a first gamma voltage generating unit configured to output a gamma voltage of a red sub pixel according to the compensated source high potential voltage; and   a second gamma voltage generating unit configured to output gamma voltages of a green sub pixel and a blue sub pixel according to the compensated source high potential voltage.   
     
     
         8 . The display device according to  claim 1 , further comprising:
 a first sensing line connected to the pixel that is most adjacent to the one side of the display panel, and configured to transmit a supplied first high potential voltage to the luminance compensating unit; and   a second sensing line connected to the pixel that is most adjacent to the another side of the display panel, and configured to transmit a supplied second high potential voltage to the luminance compensating unit.   
     
     
         9 . A display device, comprising:
 a display panel including a plurality of pixels;   a data driver configured to supply a data voltage to the plurality of pixels through a plurality of data lines, according to a gamma voltage; and   a luminance compensating unit configured to adjust the gamma voltage according to a difference value between a first high potential voltage and a second high potential voltage, the first high potential voltage being supplied to a pixel disposed in a first pixel line, among the plurality of pixels, and the second high potential voltage being supplied to a pixel disposed in a last pixel line, among the plurality of pixels.   
     
     
         10 . The display device according to  claim 9 , wherein the luminance compensating unit includes:
 a first amplifying unit configured to amplify and output the difference value between the first high potential voltage and the second high potential voltage;   a second amplifying unit configured to output a compensated source high potential voltage obtained by adding the difference value and a source high potential voltage; and   a gamma voltage generating unit configured to supply a gamma voltage to the data driver according to the compensated source high potential voltage.   
     
     
         11 . The display device according to  claim 10 , wherein the difference value output from the first amplifying unit is input to a non-inverting input terminal of the second amplifying unit, and the source high potential voltage is input to the non-inverting input terminal of the second amplifying unit. 
     
     
         12 . The display device according to  claim 10 , wherein the gamma voltage generating unit includes:
 a first gamma voltage generating unit configured to output a gamma voltage of a red sub pixel according to the compensated source high potential voltage; and   a second gamma voltage generating unit configured to output gamma voltages of a green sub pixel and a blue sub pixel according to the compensated source high potential voltage.   
     
     
         13 . The display device according to  claim 9 , further comprising:
 a first sensing line connected to the pixel disposed in the first pixel line to transmit a supplied high potential voltage to the luminance compensating unit; and   a second sensing line connected to the pixel disposed in the last pixel line to transmit a supplied high potential voltage to the luminance compensating unit.